The unforgettable first season of Penny Dreadful is drawing to a terrifying close: will Ethan (Josh Hartnett), Vanessa (Eva Green), Sir Malcolm (Timothy Dalton) and Dr. Frankenstein (Harry Treadaway) solve the mystery of Mina's (Olivia Llewellyn) disappearance before she's forever lost to demonic forces?

Below, check out a chilling sneak peak and tune in Sunday, June 29th at 10:00 p.m. ET/PT for the stunning season one conclusion of the hit Showtime drama series.

Penny Dreadful is a drama series created, written and executive produced by three-time Oscar nominee John Logan (Hugo, The Aviator, Gladiator) and executive produced by Logan's Desert Wolf Productions, along with Oscar winner Sam Mendes (American Beauty, Skyfall) and Pippa Harris (Revolutionary Road, Call The Midwife), both of Neal Street.

The series also stars Reeve Carney (Spider-Man: Turn Off the Dark), Rory Kinnear (Skyfall), Billie Piper (Doctor Who, Secret Diary of a Call Girl) and Danny Sapani (The Bill). Of the eight episodes, the first two were directed by Juan Antonio Bayona (The Orphanage, The Impossible). For more information and video clips, please visit the show's dedicated website www.penny-dreadful.com. The second season will premiere on the network in 2015.